【摘要】 精细等离子电源的输出电流纹波和动态特性,是影响切割加工质量的重要因素。针对精细等离子电源在切割含有拐角的工件时电流纹波大、动态响应慢和切割质量差的问题,对斩波式等离子电源的输出电流纹波及其影响因素进行了分析。在此基础上对主电路进行了优化设计,采用变参数比例积分(PI)控制策略,并结合切割机床的计算机数控(CNC)系统进行一体化控制。为了验证方案的有效性,搭建了额定功率45 kW的实验平台并进行了实际切割实验,实验结果表明,优化后的方案有效地提高了输出电流的动态响应速度,输出电流纹波率小于3%,工件切割面光滑,切割面倾角小于1°,达到了精细等离子切割的加工质量要求。更多还原

【Abstract】 The output current ripple and dynamic performance of fine cutting plasma cutting machine are important factors affecting cutting quality.Aiming at the problems of high current ripple,long dynamic response time and poor cutting quality of fine cutting plasma machine when cutting workpiece with corner,the output current ripple of chopper plasma power supply and its influencing factors are analyzed.On this basis,the main circuit is designed,the variable parameters proportional integral(PI)control strategy is adopted,and integrated control of computerized numerical control(CNC)system is implemented.In order to verify the effectiveness of the scheme,an experimental platform with rated power of 45 kW is built and actual cutting experiment is carried out.The results show that the optimized scheme effectively improves the dynamic response of the output current,the ripple rate of the output current is less than 3%,the cutting surface of the workpiece is smooth,and the inclination angle of the cutting surface is less than 1°,which achieves the requirements of fine cutting quality.更多还原